As shown in the website, 120 LEDs may be controlled with just 17 wires, connected to pins set to OUTPUT.
I get how we can control at least one diode of the pairs below, but what happens when we want to turn on the full board? Is that possible? More specifically, how could we turn on adjacent LEDs in order to form a square, for example?
I hope that the question is not too dumb.
Best Answer
Not a dumb question, just inexperienced. We turn on multiple LEDs one or a group at a time, and then rely on persistence of vision to fill in the rest. This is the same mechanism that a television or monitor uses to display an entire screen; it scans one line at a time, and PoV causes us to "see" the whole image at once.